Specific Heat Measurement of the Layered Nitride Superconductor LixZrNCl

Y. Taguchi; M. Hisakabe; Y. Iwasa

doi:10.1103/PhysRevLett.94.217002

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Specific Heat Measurement of the Layered Nitride Superconductor LixZrNCl

Y. Taguchi, M. Hisakabe, Y. Iwasa

DOI 10.1103/PhysRevLett.94.217002 · Physical Review Letters

T1

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Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

Specific heat has been investigated in a layered nitride superconductor, Li0.12ZrNCl, with Tc=12.7 K. The obtained data have shown a marked dichotomy: The specific heat jump at Tc (ΔC/γnTc=1.8) and the superconducting gap ratio (2Δ/kBTc=4.6–5.2) have indicated an intermediate to a strong coupling of electrons, while the upper limit of the electron-phonon coupling constant λ has directly been estimated to be 0.22, which belongs to a weak coupling regime. Furthermore, the rapid increase of γ as a function of magnetic field suggests that the present material has an anisotropic s wave gap.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Li0.12ZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	12.7	Pressure not reported	unknown
Li0.12ZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	12.5	Pressure not reported	onset
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown
HfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25.5	Pressure not reported	unknown
ZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15	Pressure not reported	unknown
Li0.17ZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
LiTi2O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.4	Pressure not reported	unknown